# Update on Epson Stylus Color 850 info

Hello;

I recently had a color tuning problem with an Epson Stylus Color
850. It was listed in the printer compatibility database as
"perfectly" working... Well, that's not exactly true...

told me the files fot the stc800 could indeed have problems.
So, the uniprint drivers for this printer need color tuning:

1) In some files, the Magenta and Cyan transfer curves were
swapped. Editing the file and swapping the lines helps a lot (if
red is printed as brown, swap the lines);
2) Even after that, colors still need tuning - blue will be purple.

I have contacted Epson, too, and although they sent me quite a nice
they are not developing anything for Linux at the moment...

+++++
So, to those interested in the Stylus Color 850 (or even the 800, I
suppose): be aware that uniprint has color tuning problems.
+++++

\begin{venting}

Hm... "Developing"? We only needd color tuning. We don't need a
driver. We *do* have a driver! These are the 3 lines in the upp file
that need to be changed:

-dupCyanTransfer="{    0.0000 0.0452 0.0836 0.1215 0.1493 0.1749 }"
-dupMagentaTransfer="{ 0.0000 0.0602 0.1133 0.1961 0.2945 0.3885 }"
-dupYellowTransfer="{  0.0000 0.0350 0.0914 0.1567 0.2430 0.2934 }"

These numbers needd tuning. Would you call that "development"? A few
numbers!!! Nothing else!

\end{venting}

database.

J.

--
Jeronimo Pellegrini
Institute of Computing - Unicamp - Brazil
http://www.dcc.unicamp.br/~jeronimo
mailto:jeronimo@dcc.unicamp.br    mailto:pellegrini@iname.com